feat: 添加获取当前用户积分余额的接口

src/main/java/com/gameplatform/server/model/dto/account/PointsBalanceResponse.java

@@ -0,0 +1,50 @@
+package com.gameplatform.server.model.dto.account;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+@Schema(description = "用户积分余额响应")
+public class PointsBalanceResponse {
+    @Schema(description = "用户ID")
+    private Long userId;
+    
+    @Schema(description = "用户名")
+    private String username;
+    
+    @Schema(description = "用户类型")
+    private String userType;
+    
+    @Schema(description = "积分余额")
+    private Long pointsBalance;
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getUserType() {
+        return userType;
+    }
+
+    public void setUserType(String userType) {
+        this.userType = userType;
+    }
+
+    public Long getPointsBalance() {
+        return pointsBalance;
+    }
+
+    public void setPointsBalance(Long pointsBalance) {
+        this.pointsBalance = pointsBalance;
+    }
+}